I got the Microsoft Exchange Server reported error (0x80040600) : ‘Unknown Error 0x80040600’. again today. Sure enough, deleting the messages in deleted items cleared the problem. When I then did a F9 synch 18 messages suddenly appeared in deleted items. Cleared those too.
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I receive error..
The message could not be sent because it rejected you as the sender. Server Response:’501 need user@domain at <John Pedersen@Fax Server’. (Account:’mail.comcast.net’,SMTP Server:’smtp.comcast.net’,Error Number: 0x800ccc78)
Thats actually a completely different error message and is likely to be because your email address is not what the mail server at comcast is expecting!